Safe Webhook Listener API with Event Processing and Validation

Create and develop a webhook listener API that is safe, ready for production, and capable of receiving, verifying, and handling inbound HTTP requests from external services.

Conditions:

1. Endpoint Configuration:
   • To receive webhook events, create a RESTful POST endpoint.
   • Make sure that versioning and routing are correct (e.g., /api/v1/webhooks).
2. Validation and Security:
   • Use techniques like token-based authentication, API keys, or HMAC signature validation to confirm the legitimacy of requests.
   • Verify the content type (such as application/json), headers, and payload structure.
   • Put in place safeguards against replay attacks (such as timestamps and nonces).
3. Processing of Events:
   • Handle and parse various event types dynamically.
   • Depending on the type of event, route it to the proper handlers or services.
   • To prevent duplicate processing, make sure it is idempotent.
4. Error Management and Reactions:
   • Give back the proper HTTP status codes, such as 200, 400, 401, and 500.
   • Errors and unsuccessful validations should be recorded with relevant messages.
5. Reliability and Scalability:
   • Encourage asynchronous processing (such as background jobs and message queues).
   • Put dead-letter handling and retry procedures in place for unsuccessful events.
6. Monitoring and Logging:
   • Keep track of incoming requests, processing outcomes, and validation results.
   • For observability, integrate with monitoring and alerting systems.
7. Documentation and Testing:
   • For event handling and validation, incorporate unit and integration tests.
   • Give concise API documentation that includes expected answers and sample payloads.

Expected Output:
Provide clear, organized code (specify your preferred language or framework if necessary), along with succinct justifications for important elements and security choices.